Improvement in grates for locomotlve-enginies



UNITED STATES PATENT OFFICE.

JOSEPH IV. POLE, OF PHILADELPHIA, PENNSYLVANIA.

A IMPROVEMENT IN GRATES FOR LOCOMOTlVE-ENGINIES.

Specification forming part of Letters Patent No. 21,021, dated July 27,1858.

T0 all whom it may concern,.-

Be it known that I, JOSEPH WV. POLE, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented a new anduseful Improvement in the Grates ot' Locomoti ves; and I do herebydeclare that the following is a full, clear, and exact description ofthe same, reference being had to the accompanying drawings, making apart of this specification, in whichj Figure l is a transverse verticalsection of a locomotive flre-box furnished with my improved grate-bars.Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is ahorizontal section of part of the grate. Fig. l is a transverse sectionof one ot the bars.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists in a certain construction of hollow grate-barswith provision for the admission of air to be forced through them by themovement of the locomotive, for the purpose of keeping them cool.

To enable others to make and use my invention, I will proceed todescribe its construction and operation.

A A are the sides of the iireboX.

B is a tubular bearer extending across the lire-box near the front tosupport the front end of the grate-bars and opening at each end to theatmosphere, besides having passages a a opening through the front of theire box. This bearer may be of cast or wrought iron.

C C are the bars, consisting of cylindrical tubes with a number ofupward hollow projections b b at short distances apart to'support thefuel, the said projections being closed and of concave form at the tops,as shown in Fig. 2, and having their tops c c made of Separate piecesand fitted into them with tenons c c", as shown in the same figure, soas to be capable of being removed and replaced by new ones when burnedout. rlhe front ends of the bars which rest upon the bearer B areclosed, as shown at CZ d in Fig. 2; but their rear ends, which projectthrough and are supported by the rear of the lire-box, are open, asshown at e in the saine ligure. The bars have each an opening f, (seeFig. 1,) which tits to a corresponding opening g (see Fig. 2)

-in the bearer B. The open ends of the bearer B are fitted withdefiector=valves 7L 71, as shown in Figs. l and 3, to conduct air intothe said bearer when the locomotive is in motion, the said valves beingmovable to the position shown in bold outline in Fig. 3, to conduct theair into the bearer when the locomotive is running forward, or to theposition shown in dotted outline in the same figure, to conduct airthereinto when the locomotive is ruiming backward. The passages a, c areitted with one or more slide-valves i, to admitand regnlate a supply ofair through the said passages, the said valve or valves being operatedby a bell-cranky', which is connected by a rod c with an arm l on ashaft m, which runs along the exterior of one side of the tre-box to thel engineers platform, where it is iturnished with a handle by which toturn it to adjust the said valve or valves. l i

When the locomotive is in motion, going forward, the pressure upon theair in front of it causes the air to rush in with great velocity at theends and passages a a of the bearer and to pass through the hollow barsC and out at the open ends e, thus keeping them cool and preventingtheir burning or being deiiected by the intense heat ot' the fire.

Vhen the locomotive runs backward, the air enters the open ends e e ofthe bars and escapes through the passages a a and open ends of thebearer and produces the same effect.

I do not claim the invention of hollow or tubular grate-bars or ofhollow bearers there for having air-passages through them; but

7What I clailn as my invention, and desire to secure by Letters Patent,is-

The construction of the tubular bars with hollow upward projections Z1b, fitted with movable top pieces c c, substantially as and for thepurpose herein specified.

J. W. POLE. Nitnessem JOHN CLOUDS, JAMES FLAKE.

